ASTM D7327-21

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D7327 −21
Standard Specification for
1
HFC Blend B (CH FCF , CHF CF , and CO )
2 3 2 3 2
This standard is issued under the fixed designation D7327; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D6806 Practice for Analysis of Halogenated Organic Sol-
vents and Their Admixtures by Gas Chromatography
1.1 This specification covers requirements for HFC Blend B
3
2.2 U.S. Government Standards:
as a fire-fighting medium.
49 CFR Part 172 Hazardous Materials Table, Special
1.2 This specification does not address the fire-fighting
Provisions, Hazardous Materials Communications, Emer-
equipment or hardware that employs HFC Blend B or the
gency Response Information, Training Requirements and
conditions of employing such equipment (for example,
Security Plans
handhelds, fixed installations, etc.).
49 CFR Part 172.101 Purpose and Use of Hazardous Mate-
1.3 This specification does not address the storage or rials Table
4
transportation of HFC Blend B. Storage, handling, and trans- 2.3 AHRI Standard:
portation issues are addressed in Practice D7326. 2008 Appendix C for Analytical Procedures for AHRI Stan-
dard 700-2014
1.4 The values stated in inch-pound units are to be regarded
5
2.4 ASHRAE Standard:
as standard. The values given in parentheses are mathematical
ASHRAEStandard34 DesignationandSafetyClassification
conversions to SI units that are provided for information only
of Refrigerants
and are not considered standard
1.5 The following safety hazards caveat pertains only to the
3. Terminology
test methods portion, Section 6, of this specification: This
3.1 Definitions of Terms Specific to This Standard:
standard does not purport to address all of the safety concerns,
3.1.1 HFC, n—hydrofluorocarbon; a chemical compound in
if any, associated with its use. It is the responsibility of the user
which the compound molecule is comprised exclusively of
of this standard to establish appropriate safety, health, and
hydrogen, chlorine, fluorine and carbon atoms.
environmental practices and determine the applicability of
3.1.2 HFC Blend B, n—tertiary blend comprised of HFC-
regulatory limitations prior to use. Specific hazards statements
134a (1,1,1,2-tetrafluoroethane), HFC-125
are given in Section 4.
(pentafluoroethane), and carbon dioxide (CO ); a compound
1.6 This international standard was developed in accor- 2
used to inert, extinguish, or suppress a fire or explosion hazard.
dance with internationally recognized principles on standard-
3.1.2.1 Discussion—The terminology system for fluorine-
ization established in the Decision on Principles for the
containing compounds (described in detail in ASHRAE Stan-
Development of International Standards, Guides and Recom-
dard34)providesaconvenientmeanstoreferencethestructure
mendations issued by the World Trade Organization Technical
of individual compounds. By definition, the first digit of the
Barriers to Trade (TBT) Committee.
numbering system represents one less than the number of
2. Referenced Documents carbon atoms in the compound molecule; the second digit, one
2 more than the number of hydrogen atoms in the compound
2.1 ASTM Standards:
molecule; and the third digit, the number of fluorine atoms in
D7326 Practice for Handling,Transportation, and Storage of
the compound molecule. Unaccounted for valence require-
HFC Blend B (CH FCF , CHF CF , and CO )
2 3 2 3 2
ments are assumed to be chlorine atoms. For example, the
designation HFC-123 indicates two carbon atoms (1 + 1), two
1
This specification is under the jurisdiction of ASTM Committee D26 on
Halogenated Organic Solvents and Fire Extinguishing Agents and is the direct
3
responsibility of Subcommittee D26.09 on Fire Extinguishing Agents. Code of Federal Regulations (CFR) documents are available from U.S.
Current edition approved June 1, 2021. Published June 2021. Originally Government Publishing Office (GPO), 732 N. Capitol St., NW, Washington, DC
approved in 2007. Last previous edition approved in 2017 as D7327-17. DOI: 20401, http://www.gpo.gov.
4
10.1520/D7327-21. Available from Air-Conditioning, Heating, and Refrigeration Institute (AHRI),
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 2311 Wilson Blvd., Suite 400, Arlington, VA 22201, http://www.ahrinet.org.
5
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from American Society of Heating, Refrigerating, and Air-
Standards volume information, r
...